character: Alfred Wegener
topic: Pioneering the Theory of Continental Drift
grade: 9
subject: Geography
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character: Harry Hess
topic: Sea-Floor Spreading and Its Role in Plate Tectonics
grade: 9
subject: Geography
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character: Marie Tharp
topic: Mapping the Ocean Floor and Evidence for Plate Tectonics
grade: 9
subject: Geography
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character: John Tuzo Wilson
topic: The Concept of Hotspots and Transform Boundaries
grade: 9
subject: Geography
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